Rear bumper



FIG. 1 is a front perspective view of a rear bumper;

FIG. 2 is a front plan view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a right side elevation view thereof (the left side elevation view is a mirror image to the right side elevation view).

The broken lines shown in FIGS. 3 and 4 are for illustrative purposes only and do not form part of the invention. 

The ornamental design for a rear bumper, as shown and described. 